BitmapImage in WPF does lock file

Question

I use:

Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute))
bmi.CacheOption = BitmapCacheOption.OnLoad

this does not Use OnLoad And file still is locked to overwrite on harddisk. Any idea how to unlock?

Regards

There are also memory issues to take a look at. See http://stackoverflow.com/questions/6271891/net-memory-issues-loading-40-images-memory-not-reclaimed-potentially-due-to-l/6271982#6271982 — Oppositional, Jun 21 '11 at 18:53
Thanks. Do you want me to say, to not try to cache all file if not really possible with your link? — Nasenbaer, Jun 21 '11 at 18:58

score 41 · Accepted Answer · answered Jun 21 '11 at 18:47

41

As shown in the question you link to, you'd need to call BeginInit and EndInit, like so as well as set the UriSource property:

Dim bmi As New BitmapImage()
bmi.BeginInit()
bmi.CacheOption = BitmapCacheOption.OnLoad
bmi.UriSource = New Uri(fiInfo.FullName, UriKind.Absolute)
bmi.EndInit()

answered Jun 21 '11 at 18:47

CodeNaked

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Thanks for your quick reply also regarding my keywords and VB instead of C#! Works great now! – Nasenbaer Jun 21 '11 at 18:54
Is there a way to do this strictly using XAML. – TrustyCoder Jul 16 '15 at 16:48

Navid Rahmani · Answer 2 · 2011-06-21T18:58:28.903

9

Read the BitmapImage from file and rewrite it with a MemoryStream:

MemoryStream ms = new MemoryStream();
BitmapImage bi = new BitmapImage();
byte[] bytArray = File.ReadAllBytes(@"test.jpg");
ms.Write(bytArray, 0, bytArray.Length);ms.Position = 0;
bi.BeginInit();
bi.StreamSource = ms;
bi.EndInit();
image.Source = bi;

edited Jun 21 '11 at 18:58

answered Jun 21 '11 at 18:49

Navid Rahmani

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Thank you Navid for your quick reply. I see that will work that way as far as I see. I am using the `bmi.EndInit()` methode + `OnLoad ` now which is a little more simple in my case. – Nasenbaer Jun 21 '11 at 18:56
Now, who owns the MemoryStream object instance and is responsible for disposing it? – Henrik May 09 '12 at 14:30
1

Anyway... How to unlock file and delete it? – NoWar Oct 26 '12 at 18:14

score 3 · Answer 3 · edited May 23 '17 at 12:17

I had a similar problem and I solved using this method: (it's a personalization of an answer here)

    public static BitmapImage BitmapFromUri(Uri source)
    {
        var bitmap = new BitmapImage();
        bitmap.BeginInit();
        bitmap.UriSource = source;
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.EndInit();
        return bitmap;
    }

You can open the image like this:

BitmapImage bimg = BitmapFromUri(new Uri(some_URI));

And it releases the image immediatly after loading it.

Hope it can helps!

score 1 · Answer 4 · answered Sep 04 '14 at 12:25

1

BitmapFrame.Create(new Uri(filePath), BitmapCreateOptions.None, BitmapCacheOption.OnLoad);

answered Sep 04 '14 at 12:25

Andreas

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BitmapImage in WPF does lock file

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